Refactors MainWindow render to make it more readable

1 files changed, 63 insertions, 45 deletions

diff --git a/src/interactive/widgets/main.rs b/src/interactive/widgets/main.rs
index 2b5d2c3..68b1ed9 100644
--- a/src/interactive/widgets/main.rs
+++ b/src/interactive/widgets/main.rs
@@ -50,58 +50,22 @@ impl MainWindow {
             state,
         } = props.borrow();
 
-        let (entries_style, help_style, mark_style) = {
-            let grey = Style {
-                fg: Color::DarkGray.into(),
-                bg: Color::Reset.into(),
-                add_modifier: Modifier::empty(),
-                ..Style::default()
-            };
-            let bold = Style::default().add_modifier(Modifier::BOLD);
-            match state.focussed {
-                Main => (bold, grey, grey),
-                Help => (grey, bold, grey),
-                Mark => (grey, grey, bold),
-            }
-        };
+        let (entries_style, help_style, mark_style) = pane_border_style(state.focussed);
+        let (header_area, content_area, footer_area) = main_window_layout(area);
+
+        let header_bg_color = header_background_color(self.is_anything_marked(), state.focussed);
+        Header.render(header_bg_color, header_area, buf);
 
-        let (header_area, entries_area, footer_area) = {
-            let regions = Layout::default()
-                .direction(Direction::Vertical)
-                .constraints([Length(1), Max(256), Length(1)].as_ref())
-                .split(area);
-            (regions[0], regions[1], regions[2])
-        };
-        {
-            let marked = self.mark_pane.as_ref().map(|p| p.marked());
-            let bg_color = match (marked.map_or(true, |m| m.is_empty()), state.focussed) {
-                (false, FocussedPane::Mark) => Color::LightRed,
-                (false, _) => COLOR_MARKED,
-                (_, _) => Color::White,
-            };
-            Header.render(bg_color, header_area, buf);
-        }
         let (entries_area, help_pane, mark_pane) = {
-            let regions = Layout::default()
-                .direction(Direction::Horizontal)
-                .constraints([Percentage(50), Percentage(50)].as_ref())
-                .split(entries_area);
-            let (left_pane, right_pane) = (regions[0], regions[1]);
+            let (left_pane, right_pane) = content_layout(content_area);
             match (&mut self.help_pane, &mut self.mark_pane) {
                 (Some(ref mut pane), None) => (left_pane, Some((right_pane, pane)), None),
                 (None, Some(ref mut pane)) => (left_pane, None, Some((right_pane, pane))),
                 (Some(ref mut help), Some(ref mut mark)) => {
-                    let regions = Layout::default()
-                        .direction(Direction::Vertical)
-                        .constraints([Percentage(50), Percentage(50)].as_ref())
-                        .split(right_pane);
-                    (
-                        left_pane,
-                        Some((regions[0], help)),
-                        Some((regions[1], mark)),
-                    )
+                    let (top_area, bottom_area) = right_pane_layout(right_pane);
+                    (left_pane, Some((top_area, help)), Some((bottom_area, mark)))
                 }
-                (None, None) => (entries_area, None, None),
+                (None, None) => (content_area, None, None),
             }
         };
 
@@ -149,4 +113,58 @@ impl MainWindow {
             buf,
         );
     }
+
+    fn is_anything_marked(&self) -> bool {
+        self.mark_pane
+            .as_ref()
+            .map(|p| p.marked())
+            .map_or(true, |m| m.is_empty())
+    }
+}
+
+fn right_pane_layout(right_pane: Rect) -> (Rect, Rect) {
+    let regions = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([Percentage(50), Percentage(50)].as_ref())
+        .split(right_pane);
+    (regions[0], regions[1])
+}
+
+fn content_layout(content_area: Rect) -> (Rect, Rect) {
+    let regions = Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([Percentage(50), Percentage(50)].as_ref())
+        .split(content_area);
+    (regions[0], regions[1])
+}
+
+fn header_background_color(is_marked: bool, focused_pane: FocussedPane) -> Color {
+    match (is_marked, focused_pane) {
+        (false, FocussedPane::Mark) => Color::LightRed,
+        (false, _) => COLOR_MARKED,
+        (_, _) => Color::White,
+    }
+}
+
+fn main_window_layout(area: Rect) -> (Rect, Rect, Rect) {
+    let regions = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([Length(1), Max(256), Length(1)].as_ref())
+        .split(area);
+    (regions[0], regions[1], regions[2])
+}
+
+fn pane_border_style(focused_pane: FocussedPane) -> (Style, Style, Style) {
+    let grey = Style {
+        fg: Color::DarkGray.into(),
+        bg: Color::Reset.into(),
+        add_modifier: Modifier::empty(),
+        ..Style::default()
+    };
+    let bold = Style::default().add_modifier(Modifier::BOLD);
+    match focused_pane {
+        Main => (bold, grey, grey),
+        Help => (grey, bold, grey),
+        Mark => (grey, grey, bold),
+    }
 }